Please help with all numbers

Mathematics
Tutor: None Selected Time limit: 1 Day

Sep 10th, 2015

Thank you for the opportunity to help you with your question!

1. There will only be 2 chances, the dollar will become smaller or bigger. Why?
Because in mathematical rules of rounding off numbers:
number below 5 will be round down and 5 and up will be rounded up.
For example:
You have a bill of $6.79  since the number next to the decimal point in the right is 7, it will be rounded up to $7.
But if your bill is $6.25, it will be rounded down to $6.00

2. The larger lines with numbers are centimeters, and the smallest lines are millimeters. Since millimeters are 1/10th of a centimeter, if you measure 7 marks after a centimeter, it is 1.7 centimeters long.

3. There are two ways of describing, or specifying the members of, a set. One way is by intensional definition, using a rule or semantic description:

A is the set whose members are the first four positive integers.
B is the set of colors of the French Flag

The second way is by extension– that is, listing each member of the set. An extensional definition is denoted by enclosing the list of members in curly brackets:

C = {4, 2, 1, 3}
D = {blue, white, red}.
One often has the choice of specifying a set either intensionally or extensionally. In the examples above, for instance, A = C and B = D

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 10th, 2015

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